Table 3 Top 5 failure mode, occurrence (O), detectability (D) and risk priority number (RPN), subscripts 1 and 2 indicate the first time and second time scores respectively
NO. | Sub_process | FM | O1/O2 | D1/D2 | S1/S2 | RPN1/RPN2 |
|---|---|---|---|---|---|---|
1 | Treatment delivery | Treatment couch movement failure | 5.2/4.8 | 6.5/3.2 | 8/8 | 264.3/102.8 |
2 | Treatment delivery | Section plan dose junction error in delivery | 4.8/4.5 | 5.6/3.1 | 9/9 | 236.7/110.4 |
3 | Treatment delivery | Setup check by MVCT failure | 6.5/3.3 | 4.5/3.5 | 7/7 | 216.8/94.6 |
4 | Immobilization | Patient immobilization error | 7.5/3.2 | 3.6/3.6 | 8/8 | 212.5/90.2 |
5 | Treatment delivery | Treatment interruption | 8.5/5.5 | 3.2/3.2 | 7/7 | 204.8/134.2 |